Definition of "Impression" :
noun: the act of pressing one thing on or into the surface of another
"He watched the impression of the seal on the hot wax."
noun: an impressionistic portrayal of a person
"He did a funny impression of a politician."
noun: (dentistry) an imprint of the teeth and gums in wax or plaster
"The dentist took an impression for use in preparing an inlay."
noun: an outward appearance
"He made a good impression."
noun: a vague idea in which some confidence is placed
"His impression of her was favorable."
noun: a clear and telling mental image
"The events left a permanent impression in his mind."
noun: all the copies of a work printed at one time
noun: a symbol that is the result of printing or engraving
noun: a concavity in a surface produced by pressing
"He left the impression of his fingers in the soft mud."